Jigsaw blade

ABSTRACT

A jigsaw blade has an elongated body with a first and second end, a cutting edge and an opposing back edge. A plurality of teeth is formed on the cutting edge. The first tooth of the plurality of teeth is immediately adjacent the second end of the blade. The first tooth is raker tooth and has a rake face and a clearance face. The rake face and clearance face intersect to form a cutting edge of the first tooth. The second end defines a plunging nose. The second end includes a nose end surface that extends between the cutting edge and the back edge. The nose end surface is on an angle of about 35° with respect to a line defined by tips of the plurality of teeth. The nose end surface intersects the first tooth relief surface to form an angled cutting edge with a leading sharp point.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No.61/007,241, filed on Dec. 11, 2007. The entire disclosure of the aboveapplication is incorporated herein by reference.

FIELD

The present disclosure relates to jigsaw blades and, more particularly,to a jigsaw blade with a plunge nose cutting tip.

BACKGROUND

Jigsaws are used for various types of cutting. Generally, a jigsaw maybe utilized wherein a first cut is plunged into a workpiece.Accordingly, when this type of cut occurs, it is important that thejigsaw cut the workpiece as soon as possible. In a number ofapplications, a pilot hole is drilled and the jigsaw blade is placedinto the pilot hole to begin cutting of the workpiece. When theworkpiece is plunged, if the jigsaw blade does not enter into theworkpiece, it may move left or right and start an enlarged kurf.Alternatively, the jigsaw blade may mar the workpiece. Marring is a bigproblem when finishing wood, used for cabinets, doors or drawers, isbeing cut by the jigsaw blade. Accordingly, it is desirable to have ajigsaw blade, when it is plunged into a workpiece, start a kurf toprovide a desired cut.

SUMMARY

The present jigsaw blade provides the art with a jigsaw blade thatprovides additional room for swarf in the kurf. The first tooth of theblade cuts a kurf into the workpiece. Additional teeth remain in thekurf to continue cutting of the workpiece. The first tooth pilots theblade along the workpiece. The first tooth is a raker tooth and drawsstraight into the workpiece and does not move left or right duringentrance into the workpiece. The present jigsaw blade creates aclearance for its nose as it is plunged into the workpiece.Additionally, the jigsaw blade provides a full tooth at the front end ofthe blade.

Accordingly to a first aspect of the disclosure, a jig saw bladecomprises an elongated body with a first and second end. A cutting edgeand an opposing back edge are formed on the elongated body. The firstend is a shanking end to secure the jigsaw blade with a jigsaw. Aplurality of teeth is formed on the cutting edge. A first tooth of theplurality of teeth is immediately adjacent the second end. The firsttooth is a full raker tooth. The first tooth has a rake face and aclearance face. The rake face and the clearance face intersect oneanother to form a cutting edge of the first tooth. The second enddefines a plunging nose. The second end includes a nose edge surfacethat extends between the cutting and back edges. The nose edge surfaceis on an angle of about 35° with respect to a line defined by the tipsof the plurality of teeth. The nose edge surface intersects the firsttooth relief surface to form a cutting edge with a sharp point and abevel edge. Thus, during plunge cutting, the sharp point begins cuttingof a workpiece forming a kurf in the workpiece. The remainder of theplurality of teeth is fleam teeth. The elongated body includes a pair ofmajor faces between the cutting and back edges. The major faces are eachangled from the cutting edge to the back edge inwardly on an angle ofabout 2°. The clearance face and the nose edge surface define anincluded angle of about 76°. Additionally, the first tooth is ground toprovide a fleam tooth.

According to a second aspect of the disclosure, a saw blade comprises anelongated body with a first and second end. A cutting edge and anopposing back edge are formed on the body. A pair of major sides isbetween the cutting and back edge. The first end is a shanking end tosecure the jigsaw blade with a jigsaw. A plurality of teeth is formed onthe cutting edge. The plurality of teeth is fleam teeth. The fleam angleof the teeth is about 25° with respect to a plane perpendicular to thelongitudinal axis of the blade. The first tooth of the plurality ofteeth is immediately adjacent the second end. The first tooth is a fullraker tooth. The first tooth is also a fleam tooth and has a rake faceand a clearance face intersecting to form a cutting edge. The second enddefines a plunging nose. The second end includes a nose edge surfaceextending between the cutting and back edges. The nose edge surface ison an angle of about 35° with respect to a line defined by the tips ofthe plurality of teeth. The nose edge surface intersects the first toothrelief surface to form a cutting edge with a sharp point and a bevelededge. The included angle formed between the first tooth relief face andthe nose edge surface has an angle value of about 42° to about 46°. Therelief surface acts as a rake face so that during plunge cutting, thesharp point begins to cut a kurf into the workpiece. The major faces areangled from the cutting edge to the back edge inwardly on an angle ofabout 2°. Also, the included angle between the clearance face and thenose edge surface is on an angle of about 76°

Further areas of applicability will become apparent from the descriptionprovided herein. It should be understood that the description andspecific examples are intended for purposes of illustration only and arenot intended to limit the scope of the present disclosure.

DRAWINGS

The described drawings are for illustration purposes only and are notintended to limit the scope of the present disclosure in any way.

FIG. 1 is a side elevation view of a jigsaw blade.

FIG. 2 is a perspective view of the blade of FIG. 1 rotated 90°.

FIG. 3 is a side elevation view of FIG. 1 rotated 180°.

FIG. 4 is an enlarged view of a portion of FIG. 1 illustrating thecutting edge.

FIG. 5 is an enlarged perspective view of the nose end of the blade ofFIG. 1.

FIG. 6 is an enlarged top plan view of FIG. 5.

FIG. 7 is a cross-sectional view of the blade of FIG. 1 through line7-7.

FIG. 8 is a view like FIG. 2 of an additional embodiment of the presentdisclosure.

FIG. 9 is a cross-section view of FIG. 8.

FIG. 10 is an enlarged top plan view of the blade of FIG. 8.

DETAILED DESCRIPTION

The following description is merely exemplary in nature and is notintended to limit the present disclosure, application, or uses.

Turning to the figures, a jigsaw blade is illustrated and identifiedwith the reference numeral 10. The blade 10 includes an elongated body12 with a first end 14 and a second end 16. The first end 14 is ashanking end that enables the jigsaw blade 10 to be secured with ajigsaw (not shown). The body 12 includes a cutting edge 18 and anopposing back edge 20. The cutting edge 18 includes a plurality of teeth22.

The plurality of teeth 22 is fleam teeth to provide alternating teethfor cutting in a left direction, right direction, left direction, rightdirection. Thus, as illustrated in FIGS. 1 and 3, every other tooth isillustrated with a pair of bevel surfaces 24, 26 on a desired fleamangle. The tooth 22 is beveled at a fleam angle of about 25° in bothdirections with respect to a plane perpendicular to the longitudinalaxis 36 of the blade. Thus, the blade is ground in both directions toestablish left and right cutting teeth as illustrated in FIGS. 1-3.

Each tooth has a rake face 28 and relief face 30 as seen in FIG. 4. Therake face 28 and relief face 30 intersect one another to form thecutting edge 32 of the tooth 22. The cutting edges 32 are angled andinclude leading tips 33 and trailing tips 34. The teeth are the samesize such that the leading tips 33 define a line substantially parallelto the axis 36 of the jigsaw blade. The rake face 28 is at a rake angleβ of about 0° to 15°, and preferably about 5°. The relief face 30 is ata clearance angle β of about 45° to 55°, and preferably 49°. Theincluded angle γ defined between the rake face and the relief face isabout 30° to 55°, and preferably at about 44°.

By having alternating teeth facing in an opposite direction, every othertooth on its major face 38, 40 cuts into the same side of the kurf.Thus, one set of teeth on major face 38 cuts the left side and the otherset of teeth on major face 40 cuts the right side of the kurf.

The body includes a pair of major faces 38 and 40. The major faces 38and 40 are angled inwardly from the cutting edge 18 toward the back edge20 at an angle of about 1° to 3°, and preferably at about 2° on eachside of the major face. Thus, a total of 2° to 6°, preferably 4°, of aback taper angle is on the saw blade. This is best illustrated in FIG.7. The back taper provides a clearance for the saw blade 10 to enablethe saw blade 10 to move around curves as the saw blade 10 is movedthrough a workpiece.

Turning to FIG. 5, the first tooth 50 immediately adjacent to theplunging nose end 16 is illustrated. The first tooth 50 is a fleam toothand is unset or is a raker tooth. The fleam angles on the bevel surfaces52, 54 are the same as those on the other teeth. Also, the first tooth50 is a full tooth having the same size as the remainder of theplurality of teeth 22. Thus, the rake face 56, as well as the reliefface 58, is the same as those previously described.

The relief face 58 terminates at the plunge nose 60. The plunge nose 60includes an end surface 62. The end surface 62 is on an angle at about30° to 45° and preferably about 35° to the longitudinal axis of the sawblade 10. This provides clearance for the end surface of the plunge nose60 when it is plunged into a workpiece. The bevel edge 58 of the fleamof the first tooth 50 extends to the nose end surface 62 to form acutting edge 64 at the nose tip of the saw blade. The cutting edge 64utilizes the relief face 58 of the first tooth 50 as its rake face. Thecutting edge 64 is curved or angled between the major sides 38, 40 toprovide a leading point 66. An included angle is formed between thefirst tooth relief face 58 and the end surface 62. The included angle δis about 66° to 96° and preferably about 76°. The bevel grind of thefleam provides a sharp cutting edge 64 as well as leading point 66.Accordingly, when the nose 60 is plunged into a workpiece, the point 66and cutting edge 64 acts as a cutting tooth to initially cut into theworkpiece to start a kurf. Thus, the saw blade 10 draws straight intothe workpiece without moving left or right or marring the workpiecesurface.

Turning to FIGS. 8-10, an additional embodiment is illustrated. Here,the saw blade is identical to that previously discussed except the sawblade is not beveled and thus, does not include the taper on the majorfaces 38′, 40′. Here, the saw blade includes the major faces 38′, 40′parallel to one another as illustrated in FIG. 9. The plurality of teeth22′ is offset with respect to one another and include cutting edges 32′perpendicular to the major faces 38′, 40′. Thus, major face 38′ includesall teeth set left with the adjacent tooth on the major face 40′ all setright. The first tooth 50′, however, is unset or is a raker tooth aspreviously described. The first tooth 50′ is milled. Thus, the cuttingedge 64′ is perpendicular to the major face 38′, 40′ and is straightwithout a leading or trailing point as seen in FIG. 10 The set on theteeth 22′ acts to provide clearance for the back edge 20 of the jigsaw10 so that it may be negotiated around curves during cutting of thejigsaw blade 10.

The description of the invention is merely exemplary in nature and,thus, variations that do not depart from the gist of the invention areintended to be within the scope of the invention. Such variations arenot to be regarded as a departure from the spirit and scope of thedisclosure.

What is claimed is:
 1. A jigsaw blade comprising: an elongated bodyhaving a first end and a second end, a blade cutting edge and anopposing, toothless back edge extending from the first end to the secondend, said first end being a shanking end for securing the jigsaw bladewith a jigsaw; a plurality of teeth formed on said blade cutting edge, afirst tooth of said plurality of teeth is immediately adjacent saidsecond end, said first tooth being a full tooth, said first tooth beinga raker tooth, said first tooth having a rake face and a relief face,said rake face and relief face intersecting one another forming a firsttooth cutting edge; said second end defining a plunging nose, saidsecond end including a substantially straight nose end surface extendingbetween said relief face and said back edge, said nose end surface beingon an angle of 30° to 45° at an intersection of the nose end surface andthe first tooth relief surface with respect to a line defined by tips ofsaid plurality of teeth, said nose end surface intersecting said firsttooth relief surface to form the nose cutting edge with a sharp leadingpoint so that during plunge cutting with said jigsaw blade, said sharpleading point initiates cutting of a workpiece.
 2. The jigsaw bladeaccording to claim 1 wherein a remainder of said plurality of teethbeing fleam teeth.
 3. The jigsaw blade according to claim 1, whereinsaid angle of said nose end surface is about 35°.
 4. The jigsaw blade ofclaim 1, wherein said elongated body includes a pair of major facesbetween said cutting and back edges said major faces are each angledfrom said blade cutting edge to said back edge on an inward angle ofabout 2°.
 5. The jigsaw blade of claim 1, wherein said clearance faceand nose end surface define an included angle of about 66° to 96°. 6.The jigsaw blade of claim 5, wherein said included angle being about76°.
 7. The jigsaw blade of claim 1, wherein said first tooth being afleam tooth.
 8. A jigsaw blade comprising: an elongated body having afirst end and a second end, a blade cutting edge and an opposing,toothless back edge extending from the first end to the second end, saidfirst end being a shanking end for securing the jigsaw blade with ajigsaw; a plurality of teeth formed on said blade cutting edge, saidplurality of teeth being fleam teeth, a first tooth of said plurality ofteeth is immediately adjacent said second end, said first tooth being afull tooth, said first tooth being a raker tooth, said first toothhaving a rake face and a relief face, said rake face and relief faceintersecting one another forming a first tooth cutting edge; said secondend defining a plunging nose, said second end including a substantiallystraight nose end surface extending between said relief face and saidback edge, said nose end surface being on an angle of 30° to 45° at anintersection of the nose end surface and the first tooth relief surfacewith respect to a line defined by tips of said plurality of teeth, saidnose end surface intersecting said first tooth relief surface to form anangled cutting edge having a leading edge portion and a trailing edgeportion, said leading edge portion forming a sharp point, an inclusionangle is formed between said first tooth relief face and said nose endsurface having an angle of about 66° to 96°, said relief surface actingas a rake face so that during plunge cutting with said jigsaw blade,said sharp point initiates cutting of a workpiece.
 9. The jigsaw bladeof claim 8, wherein the blade body has first and second major faces eachangled from said cutting edge to said back edge on an inward angle ofabout 2°.
 10. The jigsaw blade of claim 8, wherein said included anglebeing about 76°.
 11. The jigsaw blade of claim 8 wherein said remainingplurality of teeth are offset with respect to one another.
 12. Thejigsaw blade of claim 1, wherein the body includes a first major faceand a second major face, each extending between the blade cutting edgeand the back edge, and the nose cutting edge extends generallytransverse to the first and second major faces.
 13. The jigsaw blade ofclaim 12, wherein the nose cutting edge extends from the first majorface to the second major face.
 14. The jigsaw blade of claim 13, whereinthe sharp leading point is formed at an intersection between the nosecutting edge and the first major face.
 15. The jigsaw blade of claim 8,wherein the body includes a first major face and a second major face,each extending between the blade cutting edge and the back edge, and theangled cutting edge extends generally transverse to the first and secondmajor faces.
 16. The jigsaw blade of claim 15, wherein the angledcutting edge extends from the first major face to the second major face.17. The jigsaw blade of claim 16, wherein the sharp point is formed atan intersection between the angled cutting edge and the first majorface.
 18. A jigsaw blade comprising: an elongated body having a firstend and a second end, a blade cutting edge and an opposing, toothlessback edge extending from the first end to the second end, and a firstmajor face and a second major face, each extending between the bladecutting edge and the back edge, said first end being a shanking end forsecuring the jigsaw blade with a jigsaw; a plurality of teeth formed onsaid blade cutting edge, a first tooth of said plurality of teeth isimmediately adjacent said second end, said first tooth being a fulltooth, said first tooth being a raker tooth, said first tooth having arake face and a relief face, said rake face and relief face intersectingone another forming a first tooth cutting edge; said second end defininga plunging nose, said second end including a substantially straight noseend surface extending between said relief face and said back edge, saidnose end surface being at an angle with respect to a line defined bytips of said plurality of teeth, said nose end surface intersecting saidfirst tooth relief surface to form a nose cutting edge with a sharpleading point so that during plunge cutting with said jigsaw blade, saidsharp leading point initiates cutting of a workpiece, wherein said nosecutting edge extends generally transverse to the first and second majorfaces.